    <!--head-->
          <nav class="navbar-inverse" role="navigation">
                <div class="container-fluid">

                  <div class="navbar-header">
                    <a class="navbar-brand" href="#">小组</a>
                  </div>

                  
                  <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
                    <ul class="nav navbar-nav navbar-right">
                      <li><a href="#">注册</a></li>
                      <li><a href="#">登录</a></li>
                    </ul>
                    <form class="navbar-form navbar-right" role="search">
                      <div class="form-group">
                        <input type="text" class="form-control" placeholder="">
                      </div>
                      <button type="submit" class="btn btn-default">搜索</button>
                    </form>
                  </div>
                </div>
          </nav>   
  <!--head-->